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Endgames Statistical question

Sampling distributions

BMJ 2009; 338 doi: (Published 10 June 2009) Cite this as: BMJ 2009;338:b2290

This article has a correction. Please see:

  1. Philip Sedgwick, senior lecturer in medical statistics1
  1. 1Centre for Medical and Healthcare Education, St George’s, University of London, London SW17 0RE
  1. p.sedgwick{at}

    Researchers obtained birth weights for 4300 men born between 1973 and 1975. The mean birth weight was 3471 grams and the standard deviation was 540 grams. The 95% confidence interval for the mean was 3455 grams to 3487 grams.

    Which of the following statements best describes the information given by the 95% confidence interval?

    • a) 95% of men in the sample had a birth weight between 3455 and 3487 grams

    • b) There was a probability of 0.95 that the sample …

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